linux-kernel - Re: Lower than expected CPU pressure in PSI

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Message-ID: <20200109162330.GC8547@cmpxchg.org>
Date:   Thu, 9 Jan 2020 11:23:30 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: Lower than expected CPU pressure in PSI

On Wed, Jan 08, 2020 at 11:47:10AM -0800, Ivan Babrou wrote:
> P.S.: ./scripts/get_maintainer.pl kernel/sched/psi.c does not say
> Johannes Weiner is a maintainer

Mostly because psi is so intertwined with the scheduler that it's been
maintained through the scheduler tree. But let's add an entry for it,
the sched/ directory matching will ensure it shows all pertinent CCs:

$ ./scripts/get_maintainer.pl kernel/sched/psi.c 
Johannes Weiner <hannes@...xchg.org> (maintainer:PRESSURE STALL INFORMATION (PSI))
Ingo Molnar <mingo@...hat.com> (maintainer:SCHEDULER)
Peter Zijlstra <peterz@...radead.org> (maintainer:SCHEDULER)
Juri Lelli <juri.lelli@...hat.com> (maintainer:SCHEDULER)
Vincent Guittot <vincent.guittot@...aro.org> (maintainer:SCHEDULER)
Dietmar Eggemann <dietmar.eggemann@....com> (reviewer:SCHEDULER)
Steven Rostedt <rostedt@...dmis.org> (reviewer:SCHEDULER)
Ben Segall <bsegall@...gle.com> (reviewer:SCHEDULER)
Mel Gorman <mgorman@...e.de> (reviewer:SCHEDULER)
linux-kernel@...r.kernel.org (open list:SCHEDULER)

---
>From b865e10129c97c81fb83c368456d2c24e54badab Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@...xchg.org>
Date: Thu, 9 Jan 2020 10:36:58 -0500
Subject: [PATCH] MAINTAINERS: add maintenance information for psi

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 MAINTAINERS | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index bd5847e802de..228baf0e40a6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13367,6 +13367,12 @@ F:	net/psample
 F:	include/net/psample.h
 F:	include/uapi/linux/psample.h
 
+PRESSURE STALL INFORMATION (PSI)
+M:	Johannes Weiner <hannes@...xchg.org>
+S:	Maintained
+F:	kernel/sched/psi.c
+F:	include/linux/psi*
+
 PSTORE FILESYSTEM
 M:	Kees Cook <keescook@...omium.org>
 M:	Anton Vorontsov <anton@...msg.org>
-- 
2.24.1